Sanyo Bussan

As New Year's Eve approaches, the 501st Joint Fighter Wing prepares for a celebratory event in Petersburg. Eila Ilmatar Juutilainen hopes to enjoy a quiet walk with Sanya V. Litvyak before the festivities commence. Yet, their efforts to share time together are repeatedly disrupted by various interruptions. Compounding the situation, a Neuroi advances toward the base, endangering both the squadron and the holiday celebrations in Petersburg.

Thirty years ago, the world was nearly destroyed by the sudden appearance of unknown "invasive alien species." Humans and these “invasive species” continue to vie for living space, and while humanity’s safety is currently barely secured, the world could be destroyed at any moment. Living in fear of death and destruction, people go about their daily lives as if trying to avert their eyes from danger and disaster. In this world, the United Nations Hazardous Species Investigation Agency, "EXCEEDS," has begun operations to ward off crises and disasters caused by invasive species. The story begins on the island nation of "Mizuho" in the Far East. Shina Hisase is a young invasive species extermination hunter living on a remote island. What incident will befall Shina, who wishes only to live quietly with her younger sister Setsuna, her sole remaining family member?

In the war against the Neuroi, an alien force with overwhelming technology that has spread across Europe and Africa, a new combat unit is formed. Known as the 502nd Joint Fighter Wing or the Brave Witches, this group guards the eastern front, flying over the icy landscapes of Orussia to hunt down extraterrestrial enemies. When one of their members is critically injured before arriving at the base and unable to continue fighting, her sister, Hikari Karibuchi, takes her place. Despite not possessing distinctive abilities or strong magic, Hikari aims to earn the respect of her teammates and demonstrate her worth as a Witch.